6. Function blocks
6.1 Manufacturer function blocks
• Range A:
– The counter range has the value zero.
– The contacts C..ZE (actual value equal to zero) and C..FB (lower threshold value undershot) are active.
– The counter receives pulses and increases the actual value.
– C..ZE drops out as well as C..FB after the lower threshold value is reached.
• Range B:
– The counter relay counts upwards and reaches the upper threshold value.
The “upper setpoint value reached” contact C..OF becomes active.
• Range C:
The coil C..SE is briefly actuated and the actual value is set to the start value.
The contacts go to the respective position.
• Range D:
– The counting direction coil C..D_ is actuated. If counting pulses are present, downward counting is ini-
tiated.
If the lower threshold value is undershot, the contact C..FB becomes active.
• Range E:
– The reset coil C..RE is activated. The actual value will be set to zero.
– The contact C..ZE is active.
• Range F:
– The actual value goes outside the value range of the counter relay.
– The contacts OF, FB, ZE become active according to the direction of the values (positive or negative).
Retention
Counter relays can be operated with retentive actual values. You can select the num-
ber of retentive counter relays in easySoft 8Project view/System settings tab. The
retentive actual value will require 4 bytes of memory space. If a counter relay is
retentive, the actual value will be retained when the operating mode switches from
RUN to STOP and when the power supply is switched off. If the device is started in
RUN mode, the counter relay will continue to work with the non-volatile actual value.
See also
→ Section "Timing and counter relay example", page 616
→ Section "CF - Frequency counter", page 310
→ Section "CH - High-speed counter", page 316
→ Section "CI - Incremental counter", page 322
easyE402/24 MN050009ENEaton.com
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